ASTM E839-23
(Test Method)Standard Test Methods for Sheathed Thermocouples and Sheathed Thermocouple Cable
Standard Test Methods for Sheathed Thermocouples and Sheathed Thermocouple Cable
SIGNIFICANCE AND USE
5.1 This standard provides a description of test methods used in other ASTM specifications to establish certain acceptable methods for characterizing thermocouple assemblies and thermocouple cable. These test methods define how those characteristics shall be determined.
5.2 The usefulness and purpose of the included tests are given for the category of tests.
5.3 Warning—Users should be aware that certain characteristics of thermocouples might change with time and use. If a thermocouple’s designed shipping, storage, installation, or operating temperature has been exceeded, that thermocouple’s moisture seal may have been compromised and may no longer adequately prevent the deleterious intrusion of water vapor. Consequently, the thermocouple’s condition established by test at the time of manufacture may not apply later. In addition, inhomogeneities can develop in thermoelements because of exposure to higher temperatures, even in cases where maximum exposure temperatures have been lower than the suggested upper use temperature limits specified in Table 1 of Specification E608/E608M. For this reason, calibration of thermocouples destined for delivery to a customer is not recommended. Because the emf indication of any thermocouple depends upon the condition of the thermoelements along their entire length, as well as the temperature profile pattern in the region of any inhomogeneity, the emf output of a used thermocouple will be unique to its installation. Because temperature profiles in calibration equipment are unlikely to duplicate those of the installation, removal of a used thermocouple to a separate apparatus for calibration is not recommended. Instead, in situ calibration by comparison to a similar thermocouple known to be good is often recommended.
SCOPE
1.1 This document lists methods for testing Mineral-Insulated, Metal-Sheathed (MIMS) thermocouple assemblies and thermocouple cable, but does not require that any of these tests be performed nor does it state criteria for acceptance. The acceptance criteria are given in other ASTM standard specifications that impose this testing for those thermocouples and cable. Examples from ASTM thermocouple specifications for acceptance criteria are given for many of the tests. These tabulated values are not necessarily those that would be required to meet these tests, but are included as examples only.
1.2 These tests are intended to support quality control and to evaluate the suitability of sheathed thermocouple cable or assemblies for specific applications. Some alternative test methods to obtain the same information are given, since in a given situation, an alternative test method may be more practical. Service conditions are widely variable, so it is unlikely that all the tests described will be appropriate for a given thermocouple application. A brief statement is made following each test description to indicate when it might be used.
1.3 The tests described herein include test methods to measure the following properties of sheathed thermocouple material and assemblies.
1.3.1 Insulation Properties:
1.3.1.1 Compaction—direct method, absorption method, and tension method.
1.3.1.2 Thickness.
1.3.1.3 Resistance—at room temperature and at elevated temperature.
1.3.2 Sheath Properties:
1.3.2.1 Integrity—two water test methods and mass spectrometer.
1.3.2.2 Dimensions—length, diameter, and roundness.
1.3.2.3 Wall thickness.
1.3.2.4 Surface—gross visual, finish, defect detection by dye penetrant, and cold-lap detection by tension test.
1.3.2.5 Metallurgical structure.
1.3.2.6 Ductility—bend test and tension test.
1.3.3 Thermoelement Properties:
1.3.3.1 Calibration.
1.3.3.2 Homogeneity.
1.3.3.3 Drift.
1.3.3.4 Thermoelement diameter, roundness, and surface appearance.
1.3.3.5 Thermoelement spacing.
1.3.3.6 Thermoelement ductility.
1.3.3.7 Metallurgical structure.
1.3.4 Thermocouple Assembly Properti...
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This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: E839 − 23 An American National Standard
Standard Test Methods for
Sheathed Thermocouples and Sheathed Thermocouple
1
Cable
This standard is issued under the fixed designation E839; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope 1.3.2.4 Surface—gross visual, finish, defect detection by
dye penetrant, and cold-lap detection by tension test.
1.1 This document lists methods for testing Mineral-
1.3.2.5 Metallurgical structure.
Insulated, Metal-Sheathed (MIMS) thermocouple assemblies
1.3.2.6 Ductility—bend test and tension test.
and thermocouple cable, but does not require that any of these
tests be performed nor does it state criteria for acceptance. The 1.3.3 Thermoelement Properties:
acceptance criteria are given in other ASTM standard specifi-
1.3.3.1 Calibration.
cations that impose this testing for those thermocouples and
1.3.3.2 Homogeneity.
cable. Examples from ASTM thermocouple specifications for
1.3.3.3 Drift.
acceptance criteria are given for many of the tests. These
1.3.3.4 Thermoelement diameter, roundness, and surface
tabulated values are not necessarily those that would be
appearance.
required to meet these tests, but are included as examples only.
1.3.3.5 Thermoelement spacing.
1.2 These tests are intended to support quality control and to
1.3.3.6 Thermoelement ductility.
evaluate the suitability of sheathed thermocouple cable or
1.3.3.7 Metallurgical structure.
assemblies for specific applications. Some alternative test
1.3.4 Thermocouple Assembly Properties:
methods to obtain the same information are given, since in a
1.3.4.1 Dimensions—length, diameter, and roundness.
given situation, an alternative test method may be more
1.3.4.2 Surface—gross visual, finish, reference junction end
practical. Service conditions are widely variable, so it is
moisture seal, and defect detection by dye penetrant.
unlikely that all the tests described will be appropriate for a
1.3.4.3 Electrical—continuity, loop resistance, and connec-
given thermocouple application. A brief statement is made
tor polarity.
following each test description to indicate when it might be
used. 1.3.4.4 Radiographic inspection.
1.3.4.5 Thermoelement diameter.
1.3 The tests described herein include test methods to
1.3.4.6 Thermal response time.
measure the following properties of sheathed thermocouple
material and assemblies. 1.3.4.7 Thermal cycle.
1.3.1 Insulation Properties:
1.4 The values stated in either SI units or inch-pound units
1.3.1.1 Compaction—direct method, absorption method,
are to be regarded separately as standard. The values stated in
and tension method.
each system may not be exact equivalents; therefore, each
1.3.1.2 Thickness.
system shall be used independently of the other. Combining
1.3.1.3 Resistance—at room temperature and at elevated
values from the two systems may result in non-conformance
temperature.
with the standard.
1.3.2 Sheath Properties:
1.5 This standard does not purport to address all of the
1.3.2.1 Integrity—two water test methods and mass spec-
safety concerns, if any, associated with its use. It is the
trometer.
responsibility of the user of this standard to establish appro-
1.3.2.2 Dimensions—length, diameter, and roundness.
priate safety, health, and environmental practices and deter-
1.3.2.3 Wall thickness.
mine the applicability of regulatory limitations prior to use.
1.6 This international standard was developed in accor-
1
dance with internationally recognized principles on standard-
These test methods are under the jurisdiction of ASTM Committee E20 on
Temperature Measurement and is the direct responsibility of Subcommittee E20.14
ization established in the Decision on Principles for the
on Thermocouples - Testing.
Development of International Standards, Guides and Recom-
Current edition approved Nov. 1, 2023. Published November 2023. Originally
ɛ1
mendations issued by the World Trade Organization Technical
approved in 1989. Last previous edition approved in 2016 as E839 – 11 (2016) .
DOI: 10.1520/E0839-23. Barriers to Trade (TBT) Committee.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
---------------------- Page: 1 ----------------------
E839 − 23
2. Referenced Documents 2.3 Other Standard
USAEC Division of Reactor Development and Technology
2
2.1 ASTM Standards:
RDT Standard C 2-1T Determination of Insulation Com-
E3 Guide for Prepara
...
This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
´1
Designation: E839 − 11 (Reapproved 2016) E839 − 23 An American National Standard
Standard Test Methods for
Sheathed Thermocouples and Sheathed Thermocouple
1
Cable
This standard is issued under the fixed designation E839; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1
ε NOTE—Added references to Tables X1.7 and X1.8 to 10.7.4 editorially in December 2016.
1. Scope
1.1 This document lists methods for testing Mineral-Insulated, Metal-Sheathed (MIMS) thermocouple assemblies and thermo-
couple cable, but does not require that any of these tests be performed nor does it state criteria for acceptance. The acceptance
criteria are given in other ASTM standard specifications that impose this testing for those thermocouples and cable. Examples from
ASTM thermocouple specifications for acceptance criteria are given for many of the tests. These tabulated values are not
necessarily those that would be required to meet these tests, but are included as examples only.
1.2 These tests are intended to support quality control and to evaluate the suitability of sheathed thermocouple cable or assemblies
for specific applications. Some alternative test methods to obtain the same information are given, since in a given situation, an
alternative test method may be more practical. Service conditions are widely variable, so it is unlikely that all the tests described
will be appropriate for a given thermocouple application. A brief statement is made following each test description to indicate when
it might be used.
1.3 The tests described herein include test methods to measure the following properties of sheathed thermocouple material and
assemblies.
1.3.1 Insulation Properties:
1.3.1.1 Compaction—direct method, absorption method, and tension method.
1.3.1.2 Thickness.
1.3.1.3 Resistance—at room temperature and at elevated temperature.
1.3.2 Sheath Properties:
1.3.2.1 Integrity—two water test methods and mass spectrometer.
1.3.2.2 Dimensions—length, diameter, and roundness.
1.3.2.3 Wall thickness.
1
These test methods are under the jurisdiction of ASTM Committee E20 on Temperature Measurement and is the direct responsibility of Subcommittee E20.14 on
Thermocouples - Testing.
Current edition approved Nov. 1, 2011Nov. 1, 2023. Published January 2016November 2023. Originally approved in 1989. Last previous edition approved in 20112016
ɛ1
as E839 – 11.E839 – 11 (2016) . DOI: 10.1520/E0839-11R16E01.10.1520/E0839-23.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
---------------------- Page: 1 ----------------------
E839 − 23
1.3.2.4 Surface—gross visual, finish, defect detection by dye penetrant, and cold-lap detection by tension test.
1.3.2.5 Metallurgical structure.
1.3.2.6 Ductility—bend test and tension test.
1.3.3 Thermoelement Properties:
1.3.3.1 Calibration.
1.3.3.2 Homogeneity.
1.3.3.3 Drift.
1.3.3.4 Thermoelement diameter, roundness, and surface appearance.
1.3.3.5 Thermoelement spacing.
1.3.3.6 Thermoelement ductility.
1.3.3.7 Metallurgical structure.
1.3.4 Thermocouple Assembly Properties:
1.3.4.1 Dimensions—length, diameter, and roundness.
1.3.4.2 Surface—gross visual, finish, reference junction end moisture seal, and defect detection by dye penetrant.
1.3.4.3 Electrical—continuity, loop resistance, and connector polarity.
1.3.4.4 Radiographic inspection.
1.3.4.5 Thermoelement diameter.
1.3.4.6 Thermal response time.
1.3.4.7 Thermal cycle.
1.4 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each
system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the
two systems may result in non-conformance with the standard.
1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility
of the user of this standard to establish appropriate safety and healthsafety, health, and environmental practices and determine
the applicability of regulatory limitations prior to use.
1.6 This international standard was developed in accordance with internationally recognized principles on standardization
established in the Decision on Principles for the Development of International Standar
...
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